OITracker Cboe delayed data

Contract OI history

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Dec 18, 2026 EXPIRATION

TOST $29.00 Put

TOST261218P00029000

Latest saved OI1,136Oct 23, 2026
Last change+2vs previous saved observation
Saved market days12Oct 02, 2026 onwards
Daily open interest Hover a point for its date and OI
TOST $29.00 put open interest history 12 saved observations from 2026-10-02 to 2026-10-23. Exact values and changes are listed in the table below. 1,1385690 2026-10-02: 1,135 OI2026-10-05: 1,137 OI2026-10-06: 1,138 OI2026-10-07: 1,137 OI2026-10-08: 1,137 OI2026-10-09: 1,137 OI2026-10-13: 1,131 OI2026-10-14: 1,131 OI2026-10-15: 1,137 OI2026-10-16: 1,137 OI2026-10-21: 1,134 OI2026-10-23: 1,136 OI Oct 02, 2026Oct 23, 2026

All saved dates are shown. Changes compare consecutive saved observations. Missing observations are not filled with zero.

TOST contract OI by effective market date, newest first
Market dateOpen interestChange vs prior saved day
Oct 23, 20261,136+2
Oct 21, 2026Viewing1,134-3
Oct 16, 20261,1370
Oct 15, 20261,137+6
Oct 14, 20261,1310
Oct 13, 20261,131-6
Oct 09, 20261,1370
Oct 08, 20261,1370
Oct 07, 20261,137-1
Oct 06, 20261,138+1
Oct 05, 20261,137+2
Oct 02, 20261,135No prior observation